Battery charger



FIG. 1 is a right elevational view of the battery charger;

FIG. 2 is a left elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines are for the purpose of illustrating environmental structure and form no part of the claimed design. 

The ornamental design for the battery charger, as shown and described. 